i thought i had read somewhere ( internet ) that ALL injectors could be cleaned/serviced/refurbished... im not that familiar with this subject, but i am researching it. not necessarily just GM injectors but all automotive injectors... could be really handy information to have in my used car business... i appreciate all input.
Some injectors can be "cleaned/serviced/refurbished", however, this process almost never involves disassembly because that usually destroys the injector.
The cleaning is accomplished by submerging the injector in a solvent contained in an tank which is vibrated ultrasonically. The injectors are also connected to drivers which pulse the injectors while the ultrasonic "cleaning" is underway.
Injectors can only be "serviced" or "refurbished" to the extent that this ultrasonic cleaning combined with visual inspection and electrical testing can be conducted.
Most injectors used in automotive electronic fuel injection and all injectors used in GM vehicles cannot be disassembled, serviced or modified and then reassembled. As I said earlier, disassembly destroys the injector.
Most "refurbished" or "rebuilt" injectors have simply been cleaned ultrasonically, then tested electronically and, finally, flow-ested. They are not rebuilt in the sense that one replaces their coils or installs new pintels or spray plates.
Most "rebuilt" injectors are sold to the low-end of the market and, by design, are very low cost. As a result, sets of rebuilt injectors may vary in flow rates in a range greater than is acceptable for high-performance applications. For that reason, rebuilt injectors sold as a low-cost alternative to new injectors, should be carefully considered for hi-po use.
Now....injector cleaning and flow testing, performed by one of the few injector specialists who truly do high-performance work, such as RC Engineering, is a good thing. For a number of years, RC Engineering has done all my injector cleaning and flow testing.
Lastly, off-engine injector cleaning is seldom needed if 1) you've been using good gasoline, 2) you drive your car regularly, 3) your fuel system has no problems with high moisture content and 4) you occasionally use a detergent-based, pour-in injector cleaner such as 'Chevron Techron" or, even better, "Red Line Complete Fuel System Cleaner". Solvent-based cleaners, such as are sold by mass-marketers, are not as effective.
On the other hand, if you use the cheapest gas you can buy, regardless of brand, your car sees long periods of time parked and/or moisture develops in the fuel tank and/or you drive a lot of short trips and...if a pour-in, detergent-based injector cleaner was not sucessful in clearing a case of injector fouling, then off-car cleaning or even injector replacement may be necessary.
Hello all, we are a company called SouthBay Fuel Injectors. We are new to this forum......... 
